We have a 9 month old dachshund who we rehomed 2 months ago. We trained him to use bells to let us know when he needs to go outside and it's been going okay, maybe the odd accident but I'm talking a few a week (he came to us with absolutely no training and would just pee where and whenever) so we was happy with the progress. Today be used the bell a few times and also had the back door open half the day but he decided to just pee inside. He went out about 3 times (used the bells once).
I feel so deflated and mortified.